This report provides a proposed performance-related specification (PRS) for hot-mix asphalt (HMA) in the form of the Microsoft Windows®-based Quality-Related Specification Software (QRSS). The report details the research performed and illustrates the development of the QRSS and its ability to carry out pay adjustment factor and payment computations by comparing the as-built pavement performance with that of the as-designed pavement. Thus, the report will be of immediate interest to staff of state highway agencies, materials suppliers, and paving contractors with responsibility for specification and construction of HMA pavements.
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Investigation of Short-Term Laboratory Aging of Neat and Modified Asphalt Binders
Author: Anderson, David A Bonaquist, Ramon | Size: 3.56 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 76 | ISBN: 9780309213639
This report provides a proposed method of test for short-term laboratory aging of neat and modified asphalt binders using the Modified German Rotating Flask (MGRF) as an alternative to the Rolling Thin Film Oven Test (RTFOT, AASHTO T 240). Thus, the report will be of immediate interest to staff of state highway agencies, materials suppliers, and paving contractors with responsibility for specification and testing of asphalt binders.
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Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems
Author: Marzougui, Dhafer Mahadevaiah, Umashankar Tahan, Fadi Kan, Cing Dao (Steve) McGinnis, Richard Powers, Richard | Size: 35.38 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 142 | ISBN: 9780309258425
This report provides guidance for the selection, use, and maintenance of cable barrier systems. While cable barrier systems have been in use for more than 70 years, their use has been on the rise and is expected to continue in the future. The increase in use of cable barrier systems has been attributed to the success rate in keeping vehicles from crossing the median, reducing roadway departures, and decreasing impact severity. Due to advancements in cable barrier system technology, installation and repair costs are lower and cable barrier use has increased in varying roadway environments. Safety studies, although limited, have shown that cable barriers help reduce those median cross-over collisions that lead to some of the most severe head-on type crashes. This document will be of particular interest to design, maintenance, traffic, and safety engineering professionals.
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Estimating Life Expectancies of Highway Assets. Volume 2: Final Report
Author: Ford, Kevin M Arman, Mohammad H R Labi, Samuel Sinha, Kumares C Thompson, Paul D Shirole, Arun M Li, Zongzhi | Size: 19.99 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 242 | ISBN: 9780309214087
This two-volume report provides a methodology for estimating the life expectancies of major types of highway system assets, in a form useful to state departments of transportation (DOTs) and others, for use in lifecycle cost analyses that support management decision making. Volume 1 is a guidebook for applying the methodology in DOT asset management policies and programs. Volume 2 describes the technical issues and data needs associated with estimating asset life expectancies and the practices used in a number of fields—such as the energy and financial industries—to make such estimates.
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This report is an update to NCHRP Report 365, "Travel Estimation Techniques for Urban Planning" and provides guidelines on travel demand forecasting procedures and their application for solving common transportation problems. The report presents a range of approaches that allow users to determine the level of detail and sophistication in selecting modeling and analysis techniques most appropriate to their situations and addresses straight-forward techniques, optional use of default parameters, and appropriate references to other more sophisticated techniques.
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Author: Keaton, Jeffrey R Mishra, Su K Clopper, Paul E | Size: 24.76 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 184 | ISBN: 9780309214117
This report provides a methodology for estimating the time rate of scour and the design scour depth for a bridge founded on rock, as well as design and construction guidelines for application of the methodology. It will be of interest to hydraulic, bridge, and geotechnical engineers responsible for designing bridge foundations on rock or maintenance engineers concerned about existing bridges founded on erodible rock.
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Fatigue Loading and Design Methodology for High-Mast Lighting Towers
Author: Robert J. Connor Steven H. Collicott Allen M. DeSchepper Ryan J. Sherman Jaime A. Ocampo Purdue University West Lafayette, IN | Size: 10.58 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 140 | ISBN: 9780309214032
This report provides criteria for the fatigue design of high-mast lighting towers (HMLTs). The report also includes a series of proposed revisions with associated commentary to the fatigue design provisions of the "AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals." In addition, to ensure the fatigue design provisions are properly implemented into practice, design examples are also provided. The material in this report will be of immediate interest to highway design engineers.
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Calibration of Rutting Models for Structural and Mix Design
Author: Von Quintus, Harold L Mallela, Jagannath Bonaquist, Ramon Schwartz, Charles W Carvalho, Regis L | Size: 29.55 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 207 | ISBN: 978-0-309-21406-3
This report proposes revisions to the "Mechanistic-Empirical Pavement Design Guide" (MEPDG) and software to (1) incorporate three alternative rut-depth prediction models that rely on repeated load (triaxial) permanent deformation or constant height testing to provide the requisite input data, and (2) provide revised coefficients for the original and alternative rut-depth transfer functions or prediction models derived from material properties measured in the laboratory and pavement performance data. Thus, the report will be of immediate interest to engineers in public- and private-sector organizations with responsibility for the structural design and analysis of asphalt concrete pavements.
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TRB’s National Cooperative Highway Research Program (NCHRP) Report 720: Estimating the Effects of Pavement Condition on Vehicle Operating Costs presents models for estimating the effects of pavement condition on vehicle operating costs.
The models address fuel consumption, tire wear, and repair and maintenance costs and are presented as computational software that is included in the print version of the report in a CD-ROM format. The CD-ROM is also available for download from TRB’s website as an ISO image. Links to the ISO image and instructions for burning a CD-ROM from an ISO image are provided below.
Appendixes A through D to the report provide further elaboration on the work performed in the project that developed NCHRP Report 720. The appendixes, which were not included with the print version of the report, are only available for download through the link below.
• Appendix A: Fuel Consumption Models,
• Appendix B: Tire Wear Models,
• Appendix C: Repair and Maintenance Models, and
• Appendix D: An Overview of Emerging Technologies.
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Author: Mark D. Bowman | Size: 7.22 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 115 | ISBN: 978-0-309-25826-5
TRB’s National Cooperative Highway Research Program (NCHRP) Report 721: Fatigue Evaluation of Steel Bridges provides proposed revisions to Section 7—Fatigue Evaluation of Steel Bridges of the American Association of State Highway and Transportation Officials Manual for Bridge Evaluation with detailed examples of the application of the proposed revisions.
Appendixes A-D to NCHRP Report 721 are only available electronically. The appendices, which are in one electronic document, are as follows:
• Appendix A - Survey Interview Forms
• Appendix B - AASHTO Fatigue Truck Validation Analysis Results
• Appendix C - Tack Weld Tests
• Appendix D - Distortion Induced Fatigue Tests
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